diff --git a/themes/f2708f1a-8570-4d17-b779-14d5c0991ac8/chrome.css b/themes/f2708f1a-8570-4d17-b779-14d5c0991ac8/chrome.css
new file mode 100644
index 00000000..2f8f340b
--- /dev/null
+++ b/themes/f2708f1a-8570-4d17-b779-14d5c0991ac8/chrome.css
@@ -0,0 +1,9 @@
+
+html[inFullscreen="true"] {
+  #zen-main-app-wrapper {
+    --zen-element-separation: 0px;
+  }
+  .browserSidebarContainer {
+    border-radius: 0px !important;
+  }
+}
diff --git a/themes/f2708f1a-8570-4d17-b779-14d5c0991ac8/image.png b/themes/f2708f1a-8570-4d17-b779-14d5c0991ac8/image.png
new file mode 100644
index 00000000..2992a142
Binary files /dev/null and b/themes/f2708f1a-8570-4d17-b779-14d5c0991ac8/image.png differ
diff --git a/themes/f2708f1a-8570-4d17-b779-14d5c0991ac8/readme.md b/themes/f2708f1a-8570-4d17-b779-14d5c0991ac8/readme.md
new file mode 100644
index 00000000..9f2bbac4
--- /dev/null
+++ b/themes/f2708f1a-8570-4d17-b779-14d5c0991ac8/readme.md
@@ -0,0 +1,2 @@
+
+Borders are hidden when Zen Browser goes to fullscreen, just like Arc.
diff --git a/themes/f2708f1a-8570-4d17-b779-14d5c0991ac8/theme.json b/themes/f2708f1a-8570-4d17-b779-14d5c0991ac8/theme.json
new file mode 100644
index 00000000..830650a3
--- /dev/null
+++ b/themes/f2708f1a-8570-4d17-b779-14d5c0991ac8/theme.json
@@ -0,0 +1,14 @@
+{
+    "id": "f2708f1a-8570-4d17-b779-14d5c0991ac8",
+    "name": "No Borders in Fullscreen",
+    "description": "Borders are hidden when Zen Browser goes to fullscreen, just like Arc.",
+    "homepage": "",
+    "style": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/f2708f1a-8570-4d17-b779-14d5c0991ac8/chrome.css",
+    "readme": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/f2708f1a-8570-4d17-b779-14d5c0991ac8/readme.md",
+    "image": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/f2708f1a-8570-4d17-b779-14d5c0991ac8/image.png",
+    "author": "Risengan",
+    "version": "1.0.0",
+    "tags": [],
+    "createdAt": "2025-05-15",
+    "updatedAt": "2025-05-15"
+}
\ No newline at end of file